adding MARVIN_DIR envvar to travis yml file
adding MARVIN_DIR envvar to travis yml file

albireox/marvin,albireox/marvin,sdss/marvin,albireox/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin,bretthandrews/marvin,sdss/marvin,sdss/marvin,bretthandrews/marvin,bretthandrews/marvin